文档介绍：基于SD卡的MP3播放器设计
摘要
随着电子产业的迅速发展,各种袖珍型消费类电子产品应运而生,MP3便是其中的一员。但是,自从2005年以后,MP3的销售开始有所下降。对于开发一种成本、耗能更低,性能更高的MP3播放器取代现有产品,改善销售下降的趋势已变得刻不容缓。
本次设计主要针对市场上MP3的容量及播放格式有限等问题加以设计,可方便进行SD或MMC卡等微型存储器的容量扩展,并且播放MP3、WMA、WAV、MIDI等格式文件。使用者只需要将MP3等格式文件放到存储卡中,便可以播放这些音乐。本设计支持重低音、环绕音音效。本设计可以作为车载音响,也可以用于家用播放、办公场合或便携设备等。
本论文首先针对基于SD卡的MP3的播放器整体设计加以研究和介绍,并讨论系统软硬件的选择,及具体开发调试环境;然后,深入介绍了系统设计方案及其实现,并着重研究了SD卡、FAT格式、解码芯片及其软件驱动的设计;最后,详细介绍了性能优化等方面的工作及其开发前景。本设计在Atmel公司生产的atmega32单片机上实现并取得了较好的效果。
关键词:MP3播放器,AVR单片机, SD卡,音频解码,FAT分析
The Designed Of Mp3 Plyer Based On SD Card
ABSTRACT
With the rapid development of electronics industry, various mini consumer electronics products have emerged, MP3 is one of them. However, since after 2005, MP3's sales began to decline. For the development of a cost, lower power consumption, higher performance MP3 player to replace the existing products, improve sales decline has e imperative.
The article is mainly aimed at the mp3's capacity on the market and play format limited and so on to be designed to facilitate micro-SD or MMC memory cards, the capacity expansion, and play MP3, WMA, WAV, MIDI and other files. Users only need to put MP3 and other format files into the memory card, will be able to play the music. This design supports heavy bass, surround sound audio. This design not only can be used as car audio, but also can be used for home playing, office occasions, or in portable equipment.
In this paper, first of all for the SD card-based MP3 player to study the overall design and presentation, and discuss the system hardware and software choices, and specific developing and debugging environment; and then insight into the system design and its implementation, focusing on the SD card, FAT format, decoder chip and software-driven design; Finally, the detailed performance optimization aspects of the work and its development prospects. This design produced by the Atmel
’s microcontroller atmega32 to achieve and has achieved good results.
KEY WORDS:MP3 Player